Do you think if I put lit sparklers in the rear spokes of a two-smoker MB, it would also maybe light up some of the unburnt air-fuel mix coming out of the tail pipe? Now that'd be a cool light show too.

The ebay listing you popped up there would only look like a ring of light if you go very fast, I tried strapping a glowstick to my wheel to see if it would spin fast enough to look like a circle, but it didn't. You need a few around your rim to look like that.

As for igniting the gas coming out of your muffler, it will work. My muffler broke once, and the end got hot enough to glow after about 60-90 seconds of riding, then it would spit fire. Needless to say, I got a new muffler quick.

are spoke lights legal in CA ? seems like a good idea to get noticed by cars but i dont want to be getting pulled over for that, seems the same as having neon lights on a car (illegal in CA) i heard yellow is the onyl auxillary light legal idk tho